Add your dried arnica to your mason jar, then fill it the rest of the way up with olive oil. Allow it to sit in a warm sunny windowsill for 4-6.
The heat of the sun is just warm enough to extract the arnica's healing properties, without heating to too much, which could damage it.
After 4-6 weeks, strain and bottle up the oil.
This is great for sore muscles. Feel free to add essential oils to give it a good smell or even more healing properties.
Pan away might be good to add!
I buy my arnica from here
I buy my dropper bottles from here